A Qt 5.0 application embeds a QWindow within a QWidget using QWidget::createWindowContainer().
When this application is terminated on linux then it crashes with the following stack trace:

Program terminated with signal 11, Segmentation fault.
(gdb) where
#0 0x00007f9c28c8a6a7 in ?? () from /opt/Qt/5.3.0/5.3/gcc_64/plugins/platforms/libqxcb.so
#1 0x00007f9c28c8fef9 in ?? () from /opt/Qt/5.3.0/5.3/gcc_64/plugins/platforms/libqxcb.so
#2 0x00007f9c28c82db9 in ?? () from /opt/Qt/5.3.0/5.3/gcc_64/plugins/platforms/libqxcb.so
#3 0x00007f9c31b6bd23 in QWindow::create() () from /opt/Qt/5.3.0/5.3/gcc_64/lib/libQt5Gui.so.5
#4 0x00007f9c31b6f188 in QWindowPrivate::setScreen(QScreen*, bool) () from /opt/Qt/5.3.0/5.3/gcc_64/lib/libQt5Gui.so.5
#5 0x00007f9c31b6f362 in QWindow::screenDestroyed(QObject*) () from /opt/Qt/5.3.0/5.3/gcc_64/lib/libQt5Gui.so.5
#6 0x00007f9c3055c681 in QMetaObject::activate(QObject*, int, int, void**) () from /opt/Qt/5.3.0/5.3/gcc_64/lib/libQt5Core.so.5
#7 0x00007f9c3055d17f in QObject::destroyed(QObject*) () from /opt/Qt/5.3.0/5.3/gcc_64/lib/libQt5Core.so.5
#8 0x00007f9c3055ff81 in QObject::~QObject() () from /opt/Qt/5.3.0/5.3/gcc_64/lib/libQt5Core.so.5
#9 0x00007f9c31ed3f17 in QScreen::~QScreen() () from /opt/Qt/5.3.0/5.3/gcc_64/lib/libQt5Gui.so.5
#10 0x00007f9c31b5466a in QPlatformScreen::~QPlatformScreen() () from /opt/Qt/5.3.0/5.3/gcc_64/lib/libQt5Gui.so.5
#11 0x00007f9c28c8d4f9 in ?? () from /opt/Qt/5.3.0/5.3/gcc_64/plugins/platforms/libqxcb.so
#12 0x00007f9c28c7e738 in ?? () from /opt/Qt/5.3.0/5.3/gcc_64/plugins/platforms/libqxcb.so
#13 0x00007f9c28c7eb59 in ?? () from /opt/Qt/5.3.0/5.3/gcc_64/plugins/platforms/libqxcb.so
#14 0x00007f9c28c82eaf in ?? () from /opt/Qt/5.3.0/5.3/gcc_64/plugins/platforms/libqxcb.so
#15 0x00007f9c28c82f89 in ?? () from /opt/Qt/5.3.0/5.3/gcc_64/plugins/platforms/libqxcb.so
#16 0x00007f9c31b5e5b6 in QGuiApplicationPrivate::~QGuiApplicationPrivate() () from /opt/Qt/5.3.0/5.3/gcc_64/lib/libQt5Gui.so.5
#17 0x00007f9c322e3799 in QApplicationPrivate::~QApplicationPrivate() () from /opt/Qt/5.3.0/5.3/gcc_64/lib/libQt5Widgets.so.5
#18 0x00007f9c3055fe7d in QObject::~QObject() () from /opt/Qt/5.3.0/5.3/gcc_64/lib/libQt5Core.so.5
#19 0x00007f9c322e5758 in QApplication::~QApplication() () from /opt/Qt/5.3.0/5.3/gcc_64/lib/libQt5Widgets.so.5
#20 0x00000000004bb031 in main (argc=1, argv=0x7fff01dc9f08)